Insulator and method of manufacturing



Nov. 18, 1941. w. H. BURLESON INSULATOR AND METHOD OF MANUFACTURING Filed March 1, 1940 INVENTOR Wgd e H. fiur/ eson J K ATTORNEY Patented Nov. 18, 1941 INSULATOR AND METHOD OF MANUFACTURJN G Wade H. Burleson, Mansfield, Ohio, assignor to The Ohio Brass Company, Mansfield, Ohio, a corporation of New Jersey Application March 1, 1940, Serial No. 321,662

Claims.

This invention relates to electric insulators, particularly of the post type, and has for one of its objects the provision of an insulator which will be economical to manufacture and in which the percentage of losses during the manufacturing process will be low.

A further object of the invention is to provide a tubular insulator having a central battle to prevent discharge through the interior of the insulator.

A further object of the invention is to provide a device of the class named which shall be of improved construction and operation.

Other objects and advantages will appear from the following description.

The invention is exemplified by the combination and arrangement of parts shown in the accompanying drawing and described in the following specification and it is more particularly pointed out in the appended claims.

In the drawing:

The figure is a longitudinal sectional view of one form of insulator embodying the present invention.

The dielectric body of the insulator is made of plastic material, such as porcelain, and is formed in an upper section I0 and a lower section II, the two sections being united on a transverse surface l2. The sections [0 and II may be formed in the usual manner and each has a central recess 13 and M, respectively, the recesses opening through the oppositely disposed ends of the sections and being closed at their adjacent ends. The sections are of such shape and proportion that they will dry uniformly without 3 danger of cracking. The outer surfaces of the sections may be turned, either before or after drying, to provide any desired form of flange, as indicated at l5, and the ends to be joined are finished so as to fit together, as shown in the drawing. These surfaces are preferably formed with an interfitting recess and projection, as shown, to center the two parts accurately and insure a firm joint when the surfaces are joined. The sections are glazed in the usual manner, the surfaces to be joined being given a suflicient coat so that when they are placed together and subjected to the temperature of firing the glaze will firmly unite the two sections so that after the insulator is fired it will form a unitary body having a central recess provided with a transverse baflle and opposite, open ends.

Heretofore, considerable difficulty has been experienced in the formation of insulators of this the material is too thick to dry readily without cracking. When the insulator was made in tubular form so as to facilitate drying there has been danger of electric discharge through the central opening when the insulator was put into operation. The present invention avoids both of these difficulties because the central opening facilitates the drying operation and the transverse baiile prevents electrical discharge through the insulator even though there may be condensation of moisture within the opening. It is unnecessary to close the ends of the insulator to exclude communication with the atmosphere because moisture in the interior of the recesses 13 and I4 cannot produce longitudinal discharges because of the transverse baflle. Any suitable fittings I6 and I1 may be attached to the opposite ends of the insulator to facilitate connection between the insulator and its support and load.

I claim:

1. A tubular dielectric post insulator comprising two sections each composed of dielectric material and having a recess therein closed at one end and open at the other, metallic fittings attached to the open ends of said sections respectively, the closed ends of said sections being united by dielectric securing means to form a single insulator unit and to provide a transverse baille separating the recesses in said sections with the recesses and baffle interposed between said fittings, the recesses in the two sections being of approximately equal depth and the baffle being located approximately centrally between the ends of the insulator.

2. A tubular dielectric post insulator comprising two sections each composed of dielectric material and having a recess therein closed at one end and open at the other, metallic fittings attached to the open ends of said sections respectively, the closed ends of said insulators being disposed adjacent each other and united by vitrified glaze to form a single unit having recesses therein open at opposite ends of said unit and separated by a transverse bafile with the recesses and baffle interposed between said fittings, the recesses in the two sections being of approximately equal depth and the bafile being located approximately centrally between the ends of the insulator.

3. A tubular dielectric post insulator comprising separate sections each composed of dielectric material and having a recess therein closed at one end by material integral with the remainder of said section and open at the other end, me-

type. If the insulator is made of a solid mass, tallic fittings attached to the open ends of said the baffie being located approximately centrally;

between the ends of the insulator.

4. The method of manufacturing a tubulardi- I electric post insulator, comprising the steps of forming, from plastic material, two sections of approximately equal'length, each section having a recess therein to facilitate drying, the recesses.

in the two sections being of approximately equal depth, said'recesses each being open at one end and closed at the other by material integralwith the remainder of said section, dryingthe sections, arranging the closed ends of said sections in contact with the open ends extending away from each other and with a coating of glaze interposed between the contacting end faces of said sections and firing said sections to vitrify the glaze between said contacting surfaces to unite said sections in a ingle insulator unit.

5. The method of manufacturing a tubular dielectric post insulator, comprising the steps of forming, from porcelain clay, two sections of approximately equal length, each section having a recess therein, the recesses in the two sections being of approximately equal depth and each being open at one end and closed at the other by the material of said section, drying said sections, finishing the exterior surfaces of the closed ends thereof to conform with each other, glazing said insulators to provide a glaze coating over said conforming surfaces, placing said sections together with said exterior conforming surfaces in contact with each other and with the glaze coat- ,ing therebetween and firing said sections while so placed to vitrify the glaze between said conforming surfaces and thus unite said sections in a single insulator unit having recesses therein open at opposite ends of said unit and having a two-part wall forming a baflie between said recesses.

WADE H. BURLESON. 

